William a



(NoModell) w W. A. PHILLIPS;

INSULATED ELECTRICAL CONDUCTOR.

No. 380,295. P gmented Mar. 27,1888.

ammm/bo'z N. PETERS, FhuloLflhogrnphw. Wnhlngton, D. C.

UNITED STATES PATENT OFFICE.

- WILLIAM .A. PHILLIPS, OF SCHENEOTADY, NEW YORK, ASSIGNOR TO THE EDISON MACHINE WORKS, OF SAME PLACE.

INSULATED ELECTRICAL CONDUCTOR SPECIFICATION forming part of Letters Patent No. 380,295, dated March 27, 1888.

Application filed November 10, 1887. Serial No. 254,741.

To aZZ whom it may concern.-

Be it known that I, WILLIAM A. PHILLIPS, a subject of the Queen of Great Britain, residing at Schenectady, in the county of Schenec tady and State of New York, have invented a certain new and useful Improvement in Insulated Electrical Conductors, of which the following is a specification. 1

The object of my invention is to effectively insulate electrical conductors.

Rubber is found to be a suitable material for this purpose on account of its flexibility and waterproof qualities; but it lacks strength and durability, and, besides, its pores are usually found to contain moisture, which lessens its insulating property.

In the practice of my invention I take vulcanized rubber and in the form of sheets or spirally thereon, or sheets may be wrapped longitudinally. I prefer to then cover the whole with an external wound, braided,

(No model.)

woven, or wrapped covering off-abric of fibrous material.

Figure l of the drawings is an elevation of 5 a wire insulated according to my invention, and Fig. 2 a cross section thereof.

A is the Wire, B a spiral wrapping of rubber impregnated, as above described, and O the outer fabric covering.

What I claim is 1. The combination, with an electrical conductor, of an insulating covering consisting of a sheet or strip of rubber impregnated with parattine or similar moisture-proof substance 5 wrapped on said conductor, substantially as Set forth.

2. The combination, with an electrical conductor, of an insulating covering consisting of a sheet or strip of rubber impregnated with 50 paraftine or similar moisture-proof substance wrapped on said conductor, and an external fabric covering, substantially as set forth.

3. As an insulating material for electrical conductors, sheets or strips of vulcanized rub- 55 her impregnated with paraffine or similar moisture-proo'fmaterial, substantially as set forth.

This specification signed and witnessed this 7th day of November, 1887.

WILLIAM A. PHILLIPS.

Witnesses:

D. CADY SMITH, JAMES A. VAN VOAST. 

